To make a wide space at an opposite side to a side of a storage frame facing a plate material conveyance and processing system unnecessary.

A traverser 25 equipped with first and second locking hooks 27 and 29 is provided to an elevator 21 so as to move fore and aft. In such a case, when the elevator 21 is lowered below a support height position of a pallet support table 31, a locked state of the first locking hook 27 and a pallet 17 is released and the pallet 17 is handed over to the pallet support table 31, and when the elevator 21 is raised above a support height position of the pallet support table 31, the second locking hook 29 is locked to the pallet 17 and the pallet 17 is handed over to the elevator 21.